redirect-8.x-1.x-dev/tests/modules/redirect_test/redirect_test.module

<?php

/**
 * @file
 * A test module for testing the redirect module.
 */

declare(strict_types=1);

use Drupal\Core\Routing\TrustedRedirectResponse;
use Drupal\redirect\Entity\Redirect;

/**
 * Implements hook_redirect_response_alter().
 */
function redirect_test_redirect_response_alter(TrustedRedirectResponse $response, Redirect $redirect) {
  $path = 'test/redirect/2/successful';
  $replace = 'test/redirect/other';
  if ($redirect->getRedirect()['uri'] == "internal:/" . $path) {
    $response->setTargetUrl(str_replace($path, $replace, $redirect->getRedirectUrl()->setAbsolute()->toString()));
  }
}